| 摘要 |
PURPOSE:To prevent a binder from reducing its bonding power and a plasticizer from evaporating and shortening the drying time by drying a ceramics green sheet after molding under a reduced pressure. CONSTITUTION:In the case of the doctor blade method, a binder, a plasticizer, a dispersant, an additive, a solvent and the like are added to ceramics powder and sufficiently mixed and kneaded by a ball mill or the like to prepare slurry and body. The slurry thus prepared is vacuum defoamed, and coating is carried out after the viscosity of slurry is made around 20,000 cps. On the other hand, in the case of extrusion molding, the body is extracted by an extrusion molding machine, vacuum defoamed in the molding machine and then extruded to be formed into a sheet. After that, when the solvent or the like is dried, the green sheet is put into a pressure reduced drying zone and dried. As for the pressure of the reduced zone, approximately 200-several tens torr is preferred. By said process, drying can be carried out in a short period by heat drying, and because of the drying temperature, a stabilized green sheet is manufactured without showing the strength deterioration generated by the lowering binder bonding power, evaporation of the plasticizer and the like.
|
